title: 3,22-Dioxa-11,14-di-aza-penta-cyclo-[12.8.0.0(2,11).0(5,10).0(15,20)]docosa-5(10),6,8,15(20),16,18-hexa-ene-4,21-dione.
abstract: In the title compound, C18H14N2O4, the piperazine ring adopts a chair conformation and the dihedral angle between the aromatic rings is 13.09 (9)°. In the crystal, mol-ecules are linked along the c axis by C-H⋯π and N⋯π [H(N)-centroid distances = 2.8030 (2) and 3.376 (2) Å] inter-actions between neighbouring mol-ecules.
authors.affiliation: Institute of Molecular Science, Chemical Biology and Molecular Engineering Laboratory of the Education Ministry, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Ren
authors.forename: Jiao
authors.initials: J
authors.lastname: Feng
authors.forename: Jinglin
authors.initials: J
authors.lastname: Wang
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Binsheng
authors.initials: B
authors.lastname: Yang